Here are some cheats and tips for the game Rainbow Six 3: Raven Shield.
Custom mission map select:
Press Start at the main menu to enter the menu with “Campaign”, “Custom Mission”,
“Split Screen”, and other options. Press L1, R2, L2, R1, Left, Right, Square,
Circle to unlock all maps in custom mission mode. Note: This code also unlocks all
difficulty settings for the the practice missions.